netdev - Re: [bpf-next V1 PATCH 09/15] mlx5: register a memory model when XDP is enabled

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Date:   Thu, 8 Mar 2018 08:34:56 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Tariq Toukan <tariqt@...lanox.com>
Cc:     netdev@...r.kernel.org,
        BjörnTöpel <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com, eugenia@...lanox.com,
        Jason Wang <jasowang@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>, galp@...lanox.com,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        brouer@...hat.com
Subject: Re: [bpf-next V1 PATCH 09/15] mlx5: register a memory model when
 XDP is enabled

On Wed, 7 Mar 2018 13:50:19 +0200
Tariq Toukan <tariqt@...lanox.com> wrote:

> On 06/03/2018 11:48 PM, Jesper Dangaard Brouer wrote:
> > Now all the users of ndo_xdp_xmit have been converted to use xdp_return_frame.
> > This enable a different memory model, thus activating another code path
> > in the xdp_return_frame API.
> > 
> > Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> > ---
> >   drivers/net/ethernet/mellanox/mlx5/core/en_main.c |    7 +++++++
> >   1 file changed, 7 insertions(+)
> > 
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > index da94c8cba5ee..51482943c583 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > @@ -506,6 +506,13 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
> >   		rq->mkey_be = c->mkey_be;
> >   	}
> >   
> > +	/* This must only be activate for order-0 pages */
> > +	if (rq->xdp_prog)
> > +		err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq,
> > +						 MEM_TYPE_PAGE_ORDER0, NULL);
> > +	if (err < 0)
> > +		goto err_rq_wq_destroy;
> > +  
> 
> Use "if (err)" here, instead of changing this in next patch.
> Also, get it into the "if (rq->xdp_prog)" block.

Good point, fixed!

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer